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Rock joint modelling applied to jointed reservoirs
135A
Physico-chemical properties See also: 874115. 874150. X7431~'
874048 Simple method for the absolute measurement of thermal conductivity of drill cuttings Lee, T C; Henyey, T L: Damiata, B N Geophysics V51, .VS, Aug 1986, P1580-1584 A method for absolute measurement of thermal conductivity of drill cuttings is presented. The simplicity of the apparatus makes it suitable for nondestructive use of cuttings and for sample sizes too small to be measured with a needle probe. The instrumentation and method of data reduction, as well as the results of numerical modelling are described.
874049 Electrical conductivity of brine-saturated fractured rock Stesky, R M Geophysics V51, N8, Aug 1986, P1585-1593 A theoretical analysis shows that electrical conductivity along fractures in saturated porous rock is a function of many factors: fluid and rock conductivities, initial fracture aperture and contact area, fracture surface geometry (asperity height distribution and tip curvature), elastic moduli of the rock, and confining pressure or normal stress acting across the fracture.
874050 Thermal probe - a new method and its use on an unsaturated sand Ewen, J; Thomas, H R Geotechnique V37, N1, March 1987, P91-I05 The use of a thermal probe in the experimental determination of the thermal conductivity of unsaturated soil is examined. The standard method of operation of a probe is reviewed. The application of the new, generally applicable method to the specific problem of the laboratory determination of the thermal conductivity-moisture content relationship of a medium sand is examined. Details of the experimental implementation of the method, involving the use of automatic data logging and statistical identification are presented.
Permeability and capillarity 874051 Improved technique for the determination of rock porosity Melnyk, T W; Skeet, A M M Can J Earth Sci V23, N8, Aug 1986, P1068-I074
874052 Adaptive methods to solve free boundary problems of flow through porous media Chung, K Y; Kikuchi, N lnt J Num Anal Meth Geomech V I I . . V ! , Jan-Feb 1987, P1731 Grid adaptive methods combined with domain adaptation are discussed for two-dimensional seepage flow problems with free boundaries in porous media. Examples of grid and domain adaptive methods are presented to demonstrate several ways to predict grids and shapes of free boundaries using an iterative scheme. The combined adaptive methods are applied to obtain smooth non-oscillatory shape of a free boundary of seepage flow through non-homogeneous porous media. Auth.
874053 Investigations into the factors influencing long range matrix diffusion rates and pore space accessibility at depth in granite Bradbury, M H; Green, A J Hydrol V89, N1:2, 15 Dec 1986, P123-139 Mechanisms of retardation of radionuclide migration from leachates of waste material buried in fissured rocks include diffusion of nuclides from water flowing in fissures into stagnant pore water in adjacent rock, and sorption and diffusion into intact rock. Laboratory studies have examined: (1) effects of fissure surfaces on matrix diffusion processes and effects of alteration products on blocking access to the main pore structure in the intact rock: (2) effects of confining pressure or stress relaxation on diffusion rates and volume of accessible porosity; and (3) long range connectivity of pore structures. In addition, preliminary data on the blocking of pore channels by colloids are presented.
874054 Predicted and measured hydraulic conductMty of real joints Bandis, S C; Makurat, A; Vik, G Norw Geotech lnst Publ N164, 1986, l i p The hydraulic behaviour of rock joints is influenced by the mechanical interaction between roughness, wall strength, and aperture with effective stress. Effective conducting aperture is generally less than mechanical aperture due to roughness effects. A distinction is made between conducting and mechanical apertures for the purpose of numerical coupling. A model is proposed to simulate hydromechanical coupling phenomena, and preliminary comparisons between model data and laboratory tests are presented.
874055 Rock joint modelling applied to jointed reservoirs Barton, N Norw Geotech Inst Publ N164, 1986, 9P
A modified technique for the determination of the connected porosity of rocks by the water immersion method has been Reduced fluid pressure and increased effective stress in a developed and tested, and is recommended for rocks with porosity less than 0.05. The major modifications to the tech- jointed reservoir can lead to elastic or plastic deformation of nique include saturation of the sample under vacuum condi- the matrix, localised pore collapse of the matrix, normal clotions and determination of the water-saturated but surface-dry s u r e of joints, or potential shear and dilation of joints. New weight from a drying curve. Porosity measurements on 48 constitutive laws for joint behaviour have been developed, granite samples showed that the technique is reproducible together with a coupled distinct element numerical code for within a 95% confidence range of + or - 4% of the mean modelling deformation and conductivity changes in jointed value. However, the possibility of spatial variation of porosity reservoirs. The phenomena of constant productivity with simmust be taken into account in assigning uncertainties to the ultaneous compaction and hydraulic fracturing in jointed resmeasured values. ervoirs are investigated. {. 1987 Pergamon Journals Ltd. Reproduction not permitted
Physico-chemical properties See also: 874115. 874150. X7431~'
874048 Simple method for the absolute measurement of thermal conductivity of drill cuttings Lee, T C; Henyey, T L: Damiata, B N Geophysics V51, .VS, Aug 1986, P1580-1584 A method for absolute measurement of thermal conductivity of drill cuttings is presented. The simplicity of the apparatus makes it suitable for nondestructive use of cuttings and for sample sizes too small to be measured with a needle probe. The instrumentation and method of data reduction, as well as the results of numerical modelling are described.
874049 Electrical conductivity of brine-saturated fractured rock Stesky, R M Geophysics V51, N8, Aug 1986, P1585-1593 A theoretical analysis shows that electrical conductivity along fractures in saturated porous rock is a function of many factors: fluid and rock conductivities, initial fracture aperture and contact area, fracture surface geometry (asperity height distribution and tip curvature), elastic moduli of the rock, and confining pressure or normal stress acting across the fracture.
874050 Thermal probe - a new method and its use on an unsaturated sand Ewen, J; Thomas, H R Geotechnique V37, N1, March 1987, P91-I05 The use of a thermal probe in the experimental determination of the thermal conductivity of unsaturated soil is examined. The standard method of operation of a probe is reviewed. The application of the new, generally applicable method to the specific problem of the laboratory determination of the thermal conductivity-moisture content relationship of a medium sand is examined. Details of the experimental implementation of the method, involving the use of automatic data logging and statistical identification are presented.
Permeability and capillarity 874051 Improved technique for the determination of rock porosity Melnyk, T W; Skeet, A M M Can J Earth Sci V23, N8, Aug 1986, P1068-I074
874052 Adaptive methods to solve free boundary problems of flow through porous media Chung, K Y; Kikuchi, N lnt J Num Anal Meth Geomech V I I . . V ! , Jan-Feb 1987, P1731 Grid adaptive methods combined with domain adaptation are discussed for two-dimensional seepage flow problems with free boundaries in porous media. Examples of grid and domain adaptive methods are presented to demonstrate several ways to predict grids and shapes of free boundaries using an iterative scheme. The combined adaptive methods are applied to obtain smooth non-oscillatory shape of a free boundary of seepage flow through non-homogeneous porous media. Auth.
874053 Investigations into the factors influencing long range matrix diffusion rates and pore space accessibility at depth in granite Bradbury, M H; Green, A J Hydrol V89, N1:2, 15 Dec 1986, P123-139 Mechanisms of retardation of radionuclide migration from leachates of waste material buried in fissured rocks include diffusion of nuclides from water flowing in fissures into stagnant pore water in adjacent rock, and sorption and diffusion into intact rock. Laboratory studies have examined: (1) effects of fissure surfaces on matrix diffusion processes and effects of alteration products on blocking access to the main pore structure in the intact rock: (2) effects of confining pressure or stress relaxation on diffusion rates and volume of accessible porosity; and (3) long range connectivity of pore structures. In addition, preliminary data on the blocking of pore channels by colloids are presented.
874054 Predicted and measured hydraulic conductMty of real joints Bandis, S C; Makurat, A; Vik, G Norw Geotech lnst Publ N164, 1986, l i p The hydraulic behaviour of rock joints is influenced by the mechanical interaction between roughness, wall strength, and aperture with effective stress. Effective conducting aperture is generally less than mechanical aperture due to roughness effects. A distinction is made between conducting and mechanical apertures for the purpose of numerical coupling. A model is proposed to simulate hydromechanical coupling phenomena, and preliminary comparisons between model data and laboratory tests are presented.
874055 Rock joint modelling applied to jointed reservoirs Barton, N Norw Geotech Inst Publ N164, 1986, 9P
A modified technique for the determination of the connected porosity of rocks by the water immersion method has been Reduced fluid pressure and increased effective stress in a developed and tested, and is recommended for rocks with porosity less than 0.05. The major modifications to the tech- jointed reservoir can lead to elastic or plastic deformation of nique include saturation of the sample under vacuum condi- the matrix, localised pore collapse of the matrix, normal clotions and determination of the water-saturated but surface-dry s u r e of joints, or potential shear and dilation of joints. New weight from a drying curve. Porosity measurements on 48 constitutive laws for joint behaviour have been developed, granite samples showed that the technique is reproducible together with a coupled distinct element numerical code for within a 95% confidence range of + or - 4% of the mean modelling deformation and conductivity changes in jointed value. However, the possibility of spatial variation of porosity reservoirs. The phenomena of constant productivity with simmust be taken into account in assigning uncertainties to the ultaneous compaction and hydraulic fracturing in jointed resmeasured values. ervoirs are investigated. {. 1987 Pergamon Journals Ltd. Reproduction not permitted